It is still a rumor, we don't know how serious Chelsea to sign Maguire. I even think Chelsea current defenders are better than Maguire. Even if they are not strong enough but they don't score own goals at least. 
Harry Maguire is 30 years old, his market value is €20m. No team will spend €40m for Maguire, it is just nonsense to buy a player who has bad performance and he is no longer young defender. Moreover, €40m is overpriced since he is only valued €20m. I assume any club who is interested to sign him for below €10m.
The hype around an English bad player is incredible. Maguire made a lot of mistakes that ripped his team apart and he is still considered that much in market value and people still appreciate him? Foreigners or even national players in other leagues will be humiliated by everyone if they play poorly the way he did. No offence but the defence line was a circus when he play there. I find Chelsea and the other London teams quite crazy to hunt him like that. Harry Maguire is 30 years old, his market value is €20m. No team will spend €40m for Maguire, it is just nonsense to buy a player who has bad performance and he is no longer young defender. Moreover, €40m is overpriced since he is only valued €20m. I assume any club who is interested to sign him for below €10m.
The performance of Harry Maguire at Manchester United is not going to cause me to overreact, but I believe we all know that one of the main reasons for Manchester United to lose some points in the premier league and one of the main reasons for them to lose the game against Sevilla in the Europa League was Maguire. This is why I consider the 40 million dollar deal a lot for a 30-year-old player.